Reference 278343RBR-0020 presents the Datejust 31 in Yellow Rolesor, Rolex's combination of Oystersteel and yellow gold. The 31 mm Oyster case is built around a monobloc middle case with a screw-down case back and screw-down winding crown featuring the Twinlock double waterproofness system, delivering water resistance to 100 metres / 330 feet. A scratch-resistant sapphire crystal with a Cyclops lens over the date sits above a domed bezel set with diamonds.
The silver dial is itself set with diamonds held in 18 kt gold settings, while the sapphire crystal above keeps the display clear and protected. Timekeeping is handled by the Calibre 2236, a perpetual, mechanical, self-winding movement manufactured by Rolex, with bidirectional winding via a Perpetual rotor. The oscillator uses a Syloxi silicon hairspring with patented geometry and Paraflex shock absorbers, achieving a precision of -2/+2 seconds per day after casing and earning Superlative Chronometer certification — encompassing both COSC and Rolex's own post-casing standards. Power reserve stands at approximately 55 hours.
The Yellow Rolesor Jubilee bracelet, rendered in five-piece links and secured by a concealed folding Crownclasp, completes the watch with the same material pairing as the case, tying the overall composition together in a cohesive and refined manner.
